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Proceedings Paper

A kind of optimizing design method of progressive addition lenses
Author(s): Yunhai Tang; Lin Qian; Quanying Wu; Jingchi Yu; Hao Chen; Yuanyuan Wang
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Paper Abstract

Progressive addition lenses are a kind of ophthalmic lenses with freeform surface. The surface curvature of the progressive addition lenses varies gradually from a minimum value in the upper, distance-viewing area, to a maximum value in the lower, near-viewing area. A kind of optimizing design method of progressive addition lenses is proposed to improve the optical quality by modifying the vector heights of the surface of designed progressive addition lenses initially. The relationship among mean power, cylinder power and the vector heights of the surface is deduced, and the optimizing factor is also gained. The vector heights of the surface of designed progressive addition lenses initially are used to calculate the plots of mean power and cylinder power based on the principle of differential geometry. The mean power plot is changed by adjusting the optimizing factor. Otherwise, the novel plot of the mean power can also be derived by shifting the mean power of one selected region to another and then by interpolating and smoothing. A partial differential equation of the elliptic type is founded based on the changed mean power. The solution of the equation is achieved by iterative method. The optimized vector heights of the surface are solved out. Compared with the original lens, the region in which the astigmatism near the nasal side on distance-vision portion is less than 0.5 D has become broader, and the clear regions on distance-vision and near-vision portion are wider.

Paper Details

Date Published: 6 October 2010
PDF: 6 pages
Proc. SPIE 7655, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, 76551T (6 October 2010); doi: 10.1117/12.864316
Show Author Affiliations
Yunhai Tang, Soochow Univ. (China)
Lin Qian, Soochow Univ. (China)
Quanying Wu, Suzhou Univ. of Science and Technology (China)
Wenzhou Medical College (China)
Jingchi Yu, Soochow Univ. (China)
Wenzhou Medical College (China)
Ministry of Health (China)
Hao Chen, Wenzhou Medical College (China)
Ministry of Health (China)
Yuanyuan Wang, Wenzhou Medical College (China)
Ministry of Health (China)


Published in SPIE Proceedings Vol. 7655:
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies
Li Yang; Yoshiharu Namba; David D. Walker; Shengyi Li, Editor(s)

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